Yeah there is a need for a lock smith to re-do the tumblers in the locks to fit the key. Now the thing to think about is if the ignition lock has been replaced and why? Was it a repo or worse? Do you know the history? At any rate you can pull the door panel(s) off and remove the lock cylinder, then insert the key and see if the tumblers are all even of if one or more is sticking up. If the tumblers aren’t all even, then you need to take it to a lock smith and have him replace the tumblers to fit the key. About a 5 minute job.

I suppose the other thing is that the lock can be frozen and corroded but you still need to take it out to work on it. I have had to actually just remove a tumbler that was too far gone. No big deal, no one will know.